17
GB
4.5 Operating a three-phase motor with
attached frequency converter
Default setting:
„
Start“
button starts the pump
„
Stop“
button stops the pump
„
“ button (reverse rotating direction) without function
Button
I
activates mode I: „Pumping“
Button
II
activates mode II: „Emptying“
„Reset“
button resets the pump in the case of malfunction
Speed controller
(Potentiometer)
for manual speed
adjustment
Pumping
Rotating to the right
Target value set at
potentiometer
(10-50 Hz)
Emptying
Rotating to the left
Fixed speed 5 Hz
(optionally without
function)
4.6 Mechanical loads on the pump tube
The pump tube’s functioning and service life are impaired when
deformed by mechanical loads. For this reason, the outlet must
not be subjected to compressive or tensile forces. The bending
moment MB at the outlet must not exceed 50 Nm
(Fig. 5)
.
4.7 Maximum immersion depth
Make sure that the pump is not submerged further than its
discharge port
(Fig. 6)
.
5. Operation
5.1 Dry running
The pump is said to run dry if it continues to operate without
pumping any liquid
(Fig. 7)
. Dry running must be avoided. This
can be ensured by remaining in attendance or with the aid of
such technical means as a flow monitor, etc.
5.2 Suction funnel
At least the intake port must be completely covered with medium
in order to prevent the infiltration of air while pumping. When
pumping highly viscous products, care must also be taken to
prevent the formation of suction funnels.
5.3 Operation with closed discharge
The eccentric screw pump B70V-HD is a positive
displacement pump and must not be operated with
closed shutoff elements, such as the nozzle, valves, etc.
An excessive pressure build-up may result in damage.
Make sure that following max. pressure must not be
exceeded:
Pump
tube
B70V-HD
12.1
B70V-HD
25.1
B70V-HD
25.2
B70V-HD
50.1
B70V-HD
75.1
Max.
pressure
6 bar
8 bar
10 bar
8 bar
8 bar
5.4 Operation with circulation line
It is recommended to keep the liquid being pumped in
circulation in order to prevent hardening at the mechanical
seal. Remove the locking screw and connect a circulation line
with shutoff valve at the circulation connector
(Fig. 8)
. Adjust
the requested circulation flow via the shutoff valve.
